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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3af9635abcd2bb7b2c5debde8cb034c5aa6c030c66a2d71c0cff3ff596fe6c9' 
  AND token = 'wwg1/EoMUOs6p4xkSwE1gae04rYKF/sfGM1d7kQDrDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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