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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc75a55e5ae2222bbd92852f2bb6cac88f9e8d69468171d650ffd6490fb1700' 
  AND token = '3vXjBIOHR1tF8HrkWe16g2qCWMKujB1KsSjNe4Z6kh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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