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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6492b3b1663d16eb55e0e7a8619c5af09eac83046d5355bc7ef407910345f36' 
  AND token = 'MF3PrSA5dvP9m/n5Vk86enI2Ciceja1LYhJGVRiokps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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