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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30208209c32c3e548f9e0349f078b8cca51121b75bda3da3991396e1affbdf35' 
  AND token = '2cZZPYFfxqTIzDIvuOPDboNx4FtQ+rSvQsOlllna2Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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