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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a55e8392e841b6f9698e99035ab9f685536db5defa7c2c125d2c5e04508ebe' 
  AND token = 'y48EMWqFlBYQ11k/2i798b9O/bXl2WU4rC9CagudCRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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