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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb05a193e899b5dfe01c2dd766c621961bc2ad17c3cce388c5a622e4ab7c0102' 
  AND token = '0lhV8zKxwReOlXRmrfD8YATeJvVaPF2c4EDc3coY/kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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