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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c2d046b08a8f02b5be242cd7a2b5dcfd8ca8b02aeb4f5bf98d048dd20cc079' 
  AND token = 'GiKIhE1oaI3ThGKPseUWlWcwzb8KeCcjeKRH/XDwBaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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