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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f67c9f178e160822ae0ae564b4cbe7cc29e70d849f11022b069702e1b043fe7' 
  AND token = 'QrLpJHi69NdBUUEOAuxSm8ADdcagPtcEjDdab+lxC3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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