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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20db10335d3987161ebc2cc58f710072ff48dd2c56c4105b7ec2b9f99802c07b' 
  AND token = '9kMezoNwA1N3Jjyac38hJPm29xr7upO2/aV0adB42zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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