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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281ee5151348760fca3f51a77885041129b5b640d01a515c244fa52a6ebc7e0a' 
  AND token = 'hbRjOJgGD/acSZxlTCUNHrsXwOpDY1Qa0kwQLxM+gHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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