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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28ba5257c326ef5b25441663ff1c3e2da44210d5e2359b5a43e1882cdad1078' 
  AND token = '4MQxm2g+Maf+Uk0clGvLHOmHBNXSb5ini9slxLvXSRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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