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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4dc9189e4bcd056223766222c17b139fbd13a158c70e480be9cef5b1a86434a' 
  AND token = '6y8p7BFByCY8vqQ4y/6L8vC8jfq/YM9Jwr7cc26OV6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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