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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7bab2c5c86d8bfc02861e65e700181f2b1f690a464c3d7a4be65bf081d5cdc' 
  AND token = 'ODcz5mw/iVZUGksis6S8xda80q02GrmL2cbAllbqke0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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