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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739c89a4b7ef29b64ca57e3c3311a10678c972179ad395a825a86f176fef508a' 
  AND token = 'OJEZRLWDL5382ZILWtt1RUUeLzPwHxeMTGiKCXXlc1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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