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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d846274d5faee30a450103708b634d53da8f4f0740c40bda222531e2d405ae' 
  AND token = '57TIeDBA6ruRhgqUSsbBdERl7TkzZeJVJLozqGC8sRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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