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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31678477c2595d50482323400daee1e6762d88638c8f94020ef3663584f99568' 
  AND token = 'vUISJdB0QhzluJzgtzlB2iof3zJysviSkhVEvHUWc9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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