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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033eefedde07fba9dc380a4391dcde3f4d14b2f060200b1651270c135973eb3e' 
  AND token = '68n0RwRScc7C8ZGz0nCpOdq+Z35bsAlZYUJp3F8uARQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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