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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89646fdf7d96bcff203c727c7f503d78b03c0b64ee5130e264982bd8e3063ad4' 
  AND token = 'BaBqFWVMALAbc57f0kYk9wm7ZjLrZstYKVUaKUA4Jz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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