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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579da5f212b5e0610ef93add91ca4029ab9edaa5719cde2d8442f02303a12098' 
  AND token = 'I6yjj8Ct0qQHRPVFuveleOar/IFW1r2A1qx310KcpLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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