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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c58feda1353cc766e54b8e8ca6b286a20026b2a7e6c946b488f69ade3c5148b' 
  AND token = 'bKF6FzENZgsp0bqDW5dBOQ6KCWSycmLwLzrF7Vcm9Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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