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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9067833433585a0f548d0bfc845e3a1c7773c6a3f162fb2a04f10f4852c687d8' 
  AND token = 'CVtv0Sew9KqPMgs21lH7ViIF0g5lDG6Dsk7U/S3JJVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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