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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7691d0640b492f7308f331edd1565d23b9c9522807386a9b044136742a17a6' 
  AND token = 'lJ/RPbLgNVJsGFJR9R4Gb3gu30udzLGVWflg8pxrmiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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