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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c75cdad1260cebe40ca89cf6f7b9afcd324a322006869600af0d377cd948fa' 
  AND token = '7yYHZJhlSWW9R0msdMiJ2mMv/8Wng+uLGzB5MbaNH/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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