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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e9fceaacac4235a46472469e5caa0b56d3f8814df58df1a055ee17ff197250' 
  AND token = '8+pK+iUMIeTHdn3+4J+m9NewphUJ3PieuKtwLIFor3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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