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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b047aa486c98f52b0d97b6d320f3829c53ea5b9e520ad0a7e929f25fa712f1ba' 
  AND token = 'JQQ/h63fD6zXK/ryf7IixmzEWsiPQ4ltOUIdpNDh4HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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