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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526fbdf36a20bb0b6f4a6e5a011bc9ae38606736206b14e33e373487cf39307e' 
  AND token = 'ACZO7RQWKNnf9br3QEAFNGWjdk0uPC1aTuoUAqUlpeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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