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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23956f3dce54f9f0e69b0a9e03286033cb0effee394892ed7bfc3204fe8ee315' 
  AND token = 'eHUbqzBpjBjVjN2FeVw0zqmtGzwcqcpIcXs1eHEfFag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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