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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51d638b8f84e19a2622269866f1290c2b8e5349c8867f506e12ad78faa2f584' 
  AND token = 'ocKvb8fkpYnI4zlmbcDpOuLQ7pXCV8OtD1yR2KrXj0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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