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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972c57593373f60940ff60d15c22c1db07a66d0e139ec7bf170f44c1a2933ad7' 
  AND token = 'Ytp7mI4K/+a6BdTcdll7QraF5Id2VypWltNIGIGGCVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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