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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1d8103c986c5a6423ead52f24a8924fe91419cecaede5863d22139b63d5a58' 
  AND token = 'KvRQZmbhDxpQY1oaf3tChprPxC/qKrTl5bMD3XWnw5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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