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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935d4dc87c3ad73d3a1b9cb7aca58c21847cf47e0e87686695e897f3908592e3' 
  AND token = 'qf9NhsmV4EBfJe44DVUd18OD9bW2f/Rag8QQPi15oQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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