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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf50003ff6da6a292c3dbbbdc6b99006e318cf684c5e17a8de7c16f8917178c1' 
  AND token = 'u+s8FO7yhUXNgQFax8tQAjK7Zpf6lFWYwUcHdGrNC6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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