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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5fe34985a8f86830e5d30ce87ec2de603761e21a672409fd408001790c29619' 
  AND token = 'TP5MrXToO2/HyR070tH9i8JaUvePb7Jdy6Fcl8kpv5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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