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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468e0a3e184e72892ac2fde4a033db0458cd204f8d778d9cd64708e638e2350b' 
  AND token = 'AbvtGE9hh7hExdO73pIkpHirFs2iNye8GGYsXBtn4po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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