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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a94bfc7a12a9fc0b290d804a982d3e872fe4bd30093d238a5ad440f805f4b7c' 
  AND token = '82PFlU8rs0e9N7C4JLWIjnCPDX0PnUMVI84RzCAQRbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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