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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c76ad4a445efb555f880f02fecebad6c51541d97b482f59a3342269ea8ccd9' 
  AND token = 'EzZdKdq7j0Fpd7W+SQVvdqR4ah5ldz308E7CgdABgyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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