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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f01b46062cb0748c1352b6a30945b27d7fe6326536775cffad0a1dcfe8f3ba' 
  AND token = 'iM2eMY9sVLaIXEKXoaHz+YUp0mTTbiJZaJ6U0GNvUFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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