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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff10a4c43823aea26e11a3f6080b064efee347f5b01753a88dfcaa94c99bae3b' 
  AND token = 'hFlf1jOibkr2t+w6toX+3TUtE/YdP4XwJJwyFGQzlbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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