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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd15d177a837e850a5bbdfa8d03fc8c14b02c7b98155f4131bc6c6cfbc02e34' 
  AND token = 'sqjlU3FIyiNCVwlwFOBiE4cdwc9ij9ZGzx4rqZ+NgNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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