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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6fadb62e91037f54feb4d58544e6b7fa6a029c58f3b34c5b4853d5b5af56cc' 
  AND token = 'QAEOyPKfjwuPVSXGRwLGJa9UjMQA2blYTzyNNkFTTPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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