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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f235cb96afb809bf58b6d05041e8436c0fc8092eea4630b256588ba79be1a24f' 
  AND token = 'K3nzyvw1CZNJeFb3jkAjRtHt0w4FCArjUBU51qmXVeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}