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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b33ddb432bdbfd798e595fa8e04a4de972cbef7cbe7aac2bc17e91a9e71f920' 
  AND token = 'J/2d7xR4yCXS7QqR6XV6j1+jbN0Cf7ZRatfuglkfThU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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