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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae4caa794d4797ea89244d0a8fd60e60a176229b2371d2c640a722fc1a04c3d' 
  AND token = 'CAP1eO7cHAj5eFJKcrCbjNHnUe39VDMW7fIGuaggqIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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