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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c81114455024ea73a28c5e0b2128c88cfca27a1b0d63d9b4aa25e049ba1ca2' 
  AND token = 'uzz3Q6eO7wnagVUnWRVXIkL8JlMc2T5dv6AkKO3W7Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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