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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ef105cb6f2c6a7ea23de61b0a0f81685028a6e961edf71aa4c6147ca0de176' 
  AND token = 'kuJvMQmiLy1cHo8OHiIdY3o2zspGnMIlEMXqa7cJFGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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