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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3e78e8d61410733ca0b3c110e410369108b0ac6aa61979e58ae635100c9477' 
  AND token = '7Lrr8XzWdakPyVKT97uaXh1izQ2vGZL0RWqZZvrSZgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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