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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd167e6308b7245a480b87a6a14ee6680e7ed4580a5184d6f21f3131c5e3b84da' 
  AND token = 'WMEOXU98kMNIzwXscdpQ0nez09igV0P3I6y5vc0EyJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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