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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d5a7d5d5e712c3a7adf8fc556b05bc9ba0d4994820a8229f9f4a4d157c8502' 
  AND token = '1YALS4pf2yxu6jvkrfNBqOTy9QTjyzU3MQKk3KXZ4vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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