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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7804289d5123a82b483e592596a8b762512653ebe29f43895d7158af77d6a90' 
  AND token = 'KaSzaJZSed2IefXTdadeT+YV0a1uErbl5OZ3LxuHRhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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