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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8cadeffae796f10e32bf2407328e3823f7aef60948c1e81ad166570611e19cd' 
  AND token = 'f5ZJqYDGwt/7vE0aYZg96GwRaB1iPJn9TSS1nwq/IH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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