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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1193294e321d3b467fb656c218903ac2bb9758669d82d5c020d0316f79a563' 
  AND token = 'w3xu4CmbJuFumwSw+v6cccS044XkK7mXdYzuDxZ43r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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