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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13a95d49700c111a9f10b13184da7be2a1833db7c10e88136aa8500cbfa952b' 
  AND token = 'YERl1h7uEwLZ5NZ65b/8J0kO+G7rP0HD9v6qKrhTjq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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