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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e19dbee834177fb6d7c91803b5a4ad62773fa0a6b517605eece5f8086a8462' 
  AND token = 'iN7VDQ5a50g5JQZDUnzy/2ZJRvTFKv6qtz1eqg281iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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