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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22ee81b712b6f1441867315ebe1341bcc8d85f3ac357fd3f10dc801904230b1e' 
  AND token = 'JFsRBQYvvR2v1y5Zm2sSvlR3azEdJFWZw6lWNrmXL5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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