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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018d54b7ed09705a14997778843293e47b6566199173feb5738b300bc0549a79' 
  AND token = 'DXaVZ+YP8K5jff/10nPJETeWx+q4h3P1/TLAPKOGIsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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