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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b807b99380dc40f4d3543da7e807a6d3f004ffe300eb871b55a239cc4d8331c6' 
  AND token = '8SPCsAAlgUP5acGmFjhAZRIC7ZQxcE7SXkHY5Yc6x0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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