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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117f0119f9312f54b2da53c684179eac92193a4cbe652049b99649870c06ba9c' 
  AND token = 'hXs6EnrBzRqKTO2Da5B5IYsTS5Rq9iP3HO6FPI9mw+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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