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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679bdc245ae716659184c0c2f95ac3f93e373831a7410df02aa10d739f6e8592' 
  AND token = 'fOvUW1PT04gNCqJSQLAdq9FOciYW5S30sEuPqFZda7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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