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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f0519d3a7567f29f2a72710e6b1f093d315d031d6df825bdf9ac77e10d7211' 
  AND token = '4x5kxCpZBieyqmN3VQXcWxS9YB8v1X59Jx7pKfSx5gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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