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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49d39503a4ddc227fe7570a582efe52b4eb8be21a5ae586e3c769e265582640' 
  AND token = '4lVAheqP8UQDPKuEsPgcRF9k83nksl08rt2M520R6cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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